Sokol’s purchase of about $10 million in Lubrizol stock while facilitating Buffett’s deal to buy the lubricant maker “violated company policies, including Berkshire Hathaway’s Code of Business Conduct and Ethics and its insider-trading policies and procedures,” according to the report.

Buffett, 80, is facing questions about his oversight of managers and criticism for not condemning the stock trading that preceded Sokol’s resignation from Berkshire. Buffett had said March 30 in announcing Sokol’s departure that he didn’t believe the trades were unlawful.

“They’re throwing Sokol under the bus,” said Stephen Bainbridge, a professor at the UCLA School of Law who has written and taught about corporate governance.

Sokol’s purchase of about $10 million in Lubrizol stock while facilitating Buffett’s deal to buy the lubricant maker “violated company policies, including Berkshire Hathaway’s Code of Business Conduct and Ethics and its insider-trading policies and procedures,” according to the report.

Buffett, 80, is facing questions about his oversight of managers and criticism for not condemning the stock trading that preceded Sokol’s resignation from Berkshire. Buffett had said March 30 in announcing Sokol’s departure that he didn’t believe the trades were unlawful.

“They’re throwing Sokol under the bus,” said Stephen Bainbridge, a professor at the UCLA School of Law who has written and taught about corporate governance.